2005 INFINITI FX35 Service Manual

horn isofix service interval transmission fluid sport mode clock

Page 1881 of 4731

INFINITI FX35 2005 Service Manual EC-488
[VQ35DE]
DTC P1271, P1281 A/F SENSOR 1
Revision: 2005 July 2005 FX
DTC P1271, P1281 A/F SENSOR 1PFP:22693
Component DescriptionABS00A9T
The air fuel ratio (A/F) sensor is a planar dual-cell lim

EC-488
[VQ35DE]
DTC P1271, P1281 A/F SENSOR 1
Revision: 2005 July 2005 FX
DTC P1271, P1281 A/F SENSOR 1PFP:22693
Component DescriptionABS00A9T
The air fuel ratio (A/F) sensor is a planar dual-cell limit current sen-
sor. The sensor element of the air fuel ratio (A/F) sensor is the com-
bination of a Nernst concentration cell (sensor cell) with an oxygen-
pump cell, which transports ions. It has a heater in the element.
The sensor is capable of precise measurement = 1, but also in the
lean and rich range. Together with its control electronics, the sensor
outputs a clear, continuous signal throughout a wide range (0.7 < < air).
The exhaust gas components diffuse through the diffusion gap at the
electrode of the oxygen pump and Nernst concentration cell, where
they are brought to thermodynamic balance.
An electronic circuit controls the pump current through the oxygen-
pump cell so that the composition of the exhaust gas in the diffusion
gap remains constant at = 1. Therefore, the air fuel ratio (A/F) sen-
sor is able to indicate air/fuel ratio by this pumping of current. In
addition, a heater is integrated in the sensor to ensure the required
operating temperature of 700 - 800 °C (1,292 - 1,472 °F).
CONSULT-II Reference Value in Data Monitor ModeABS00A9U
Specification data are reference values.
On Board Diagnosis LogicABS00A9V
To judge the malfunction, the diagnosis checks that the A/F signal computed by ECM from the air fuel ratio (A/
F) sensor 1 signal is not inordinately low.
DTC Confirmation ProcedureABS00A9W
NOTE:
If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at
least 10 seconds before conducting the next test.
TESTING CONDITION:
Before performing the following procedure, confirm that battery voltage is more than 11V at idle.
WITH CONSULT-II
1. Start engine and warm it up to normal operating temperature.
2. Select “A/F SEN1 (B1)” or “A/F SEN1 (B2)” in “DATA MONITOR” mode with CONSULT-II.
SEF579Z
SEF580Z
MONITOR ITEM CONDITION SPECIFICATION
A/F SEN1 (B1)
A/F SEN1 (B2)
Engine: After warming up Maintaining engine speed at
2,000 rpm Fluctuates around 1.5V
DTC No. Trouble diagnosis name DTC detecting condition Possible Cause
P1271
1271
(Bank 1) Air fuel ratio (A/F) sensor 1
circuit no activity detected
The A/F signal computed by ECM from the
air fuel ratio (A/F) sensor 1 signal is con-
stantly approx. 0V.Harness or connectors
(The air fuel ratio (A/F) sensor 1 cir-
cuit is open or shorted.)
Air fuel ratio (A/F) sensor 1
P1281
1281
(Bank 2)

Page 1882 of 4731

INFINITI FX35 2005 Service Manual DTC P1271, P1281 A/F SENSOR 1 EC-489
[VQ35DE]
C
D E
F
G H
I
J
K L
M A
EC
Revision: 2005 July 2005 FX
3. Check “A/F SEN1 (B1)” or “A/F SEN1 (B2)” indication.
If the indication is

Page 1883 of 4731

INFINITI FX35 2005 Service Manual EC-490
[VQ35DE]
DTC P1271, P1281 A/F SENSOR 1
Revision: 2005 July 2005 FX
Wiring DiagramABS00A9X
BANK 1
TBWM0390E

Page 1884 of 4731

INFINITI FX35 2005 Service Manual DTC P1271, P1281 A/F SENSOR 1 EC-491
[VQ35DE]
C
D E
F
G H
I
J
K L
M A
EC
Revision: 2005 July 2005 FX
Specification data are reference values and are measured between each terminal and gro

Page 1885 of 4731

INFINITI FX35 2005 Service Manual EC-492
[VQ35DE]
DTC P1271, P1281 A/F SENSOR 1
Revision: 2005 July 2005 FX
BANK 2
TBWM0391E

Page 1886 of 4731

INFINITI FX35 2005 Service Manual DTC P1271, P1281 A/F SENSOR 1 EC-493
[VQ35DE]
C
D E
F
G H
I
J
K L
M A
EC
Revision: 2005 July 2005 FX
Specification data are reference values and are measured between each terminal and gro

Page 1887 of 4731

INFINITI FX35 2005 Service Manual EC-494
[VQ35DE]
DTC P1271, P1281 A/F SENSOR 1
Revision: 2005 July 2005 FX
2. CHECK AIR FUEL RATIO (A/F) SENSOR 1 POWER SUPPLY CIRCUIT
1. Disconnect air fuel ratio (A/F) sensor 1 harness connector.
2

Page 1888 of 4731

INFINITI FX35 2005 Service Manual DTC P1271, P1281 A/F SENSOR 1 EC-495
[VQ35DE]
C
D E
F
G H
I
J
K L
M A
EC
Revision: 2005 July 2005 FX
4. CHECK AIR FUEL RATIO (A/F) SENSOR 1 INPUT SIGNAL CIRCUIT
1. Turn ignition switch O

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